Roller-cutter mounting



Sept. 24, 1929. C; H M, BULL ROLLER CUTTER MOUNTING Filed Aug. 15. 1927 Patented Sept. 24, 1929 AUNITED STATES PATENT Aoui-"1era CLINTON H. .'Bll'LL,` OI'. HOUSTON, TEXAS, ASSIGNOR TO REED ROLLER BIT COH- 4ramt, or HOUSTON, TEXAS,

A CORPORATION' 0F TEXAS .ROLLER-CUTTER MOUNTING Application led August 15,

This invention relates to roller bits for use in deep well drilling and more particu` larly to means whereby roller cutters may be mounted in bit heads, comprising a modifica- 5 tion of the invention shown and claimed in my application for Letters APatent of the United States, filed March 28th, 1927, Serial No. 178,987. v

The invention shown in my said application is adapted particularly for use with a two-piece blt head.

It is the object of the present invention to provide a construction similar to that disclosed in my said application but adapted for use with a one-piece 2bit head.

vIn roller bits of this general type, wherein roller cutters are mounted on opposite sides of a recess in the bottom of a bit head, the distance between the roller cutters is less' than the distance either of said roller cutters would have to be moved toward the other to effect removal thereof from the head. This has made necessary two-piece heads.

It is particularly the object of this invention to provide means whereby said roller cutters may be moved laterall into and out of a one-piece head, each in ependently of the other. y y

The invention, however, has various other objects which, together with the many other advantages thereof, will be apparent to those skilled in the art, from the accompanying drawings and following description.

The preferred embodiment of the invention is illustrated in the accompanying drawings, wherein Fig. 1 is a side elevation, partly in section of the parts assembled in the bit head; Fig. 2 a detail fragmentary view of a part of the head showing the spindle bore beveled annular ilanfge, and key slots; an Fig; 3 a detail view o the bushing.

Referring more particularly to the drawings, a one-piece bit head is 'indicated at l, having a recess 1 in the bottom thereof, and also a recess 2 in the outer face thereof, and a bore 3 leading inwardly from recess 2 to recess 1, and adapted to receive a spindle 4, spindle 4 having a reduced screw-threaded inner end 4a and a circumferential flange 4",

1927. smal No. 212,993.7,

and a s uared projection 4 on its outer end. Circum erential flange 4b rests in the bottom of recess 2.

In the present invention, an annular transversely beveled iiange 5 is provided adjacent 55 bore 3, said flange being beveled from its lower portion upwardly, the beveled face of said flange being indicated at 5*. A bushing 6 having a correspondingly beveled inner face, has a screw-threaded recess 6, to receive 60 spindle 4, and when said bushing is screwed ,on said spindle, the inner beveled face thereof rests against the beveled face of annular 4flange 5.

In the prior constructions, it has been customa-ry to provide an annular flange rojecting inwardlly)7 from the head adjacent t e bore, said lan e eing of substantially cylindrical form. uch construction has necessitated the employment of a two-piece head, for the reasons hereinabove pointed out.

The present invention provides a construction whereby independent removal of the cutters can be effected by laterally sliding the same into and out of the head, the contactf ing beveled faces of the flange 5 Aand bushing 6 being in a substantiall vertical plane. The spindle 4, it will be un erstood, is removable outwardly from bushing 6 and bore 3, after which removal the beveled face of bushing 6 is free Vto slide on the beveled face of flange 5.

Surrounding flange 5 is another bushing 7, said bushing being cylindrical in form, and having a circumferential base flan e 7.

Bushing 7 and flange 5 have key slots b and 85 v i 5", respectiveiy, to receive key 6b of bushing 6, whereby bushing 6 is locked against rota-l tion with respect to the head. The u per end of key 6b also rojects slightly into t e head, as shown. A ey 7c is formed integral with 90 the base flange 7 F of bushing 7. The head 1` has a recess, as shown, to receive key 7 c,

whereby bushin 7 is locked against rotation with respect to t e head.

Bushing 6 has a circumferential flange 6. 95 The cutter comprises a base section 8 and a point section 9, the base section 8 having a ore to receive bushing 7, and a recess to receive flange 6 of bushing 6.

Point section 9 is mounted upon the end of loo bushing 6, and rests slidably upon flange 6c, within base section 8. .Bushing 6 has a circumferential groovel 6, and into this groove and the many advantages thereof briefly referred to, as follows: t n

Bushing 6 is lirst/ slipped into the recess in point section 9, and the-pins 10 are screwed be appreciated.

inwardly into circumferential groove 6, to rotatably locksaid point section on'saidbushing. Point section 9 may then be placedy within the recess ofbase section -8. Circumferential lan e 6c the recess of base section 8, and the beveled ortion thereof will extend into the bore in Ease section 8. Bushing 7 may then be interposed between base section 8 and bushing 6,

key 6b of bushing 6. bushing 7.

- Thus assembled, thel cutter with its bushings, may be slid laterally and upwardly into place in the head, and when 1t 1s so slld, key 6l? will engage in slot 5h entering key slot 7h bf 1n the lower end of flange 5, andthe upper end of key 6" will project slightly into the head, as shown; and ke prbvided therefor in the head. Y

After the cutter has been moved into place, spindle 4 is inserted from the outside of the head into bore 3 and screwed into bushing 6. A suitable wrench' may be'brought into engagement with the squared projection 4 of spindle 4 to screw said spindle into bushmg 6. The spindle 4 is screwed inwardly until flange 4b thereof rests upon the bottom of recess 2. The assembl of the cutter in the head is thereby comp eted. j

`No inward movement ofthe roller cutter with respect to the head, or',stated differently, toward the other cutter, is necessary to the removal of said-cutter. When spindle 4 is unscrewed said cutter will ordinarily/drop out of the head. If the friction between the parts is such that the force of gravity is in'suicient. to move said cutter out of the head, a slight ull downwardly will effect removal ther-eci? 1 It will be obviousvto/those skilled in the art that 'the invention provides a strong and` durableconstruction, and the ease with which cutters may, by the means shown, be removed from and mountedl in one-piece heads, will '.While I have illustrated and described my invention in connection with a particular type of bit, ,-it is to be understood that my invention is I,not limited either to the specific use o r construction disclosed and described. V'The invention may be usedin various other The assembly of the parts may be outlined,-

of bushing 6 will rest in' 7 of bushing 7 will extend linto the recess ways, and the construction thereof .may be scope of the vfollowing claims.

I claim:

1. In a rotary boring drill, a head having a projection thereon, a cutter, a transversely beveledbushing in said cutter to engage said projection, and means to removably secure said cutter on said projection.

2. In a rotary boring drill, a head having a transversely beveled annular flange thereon,a cutter,l an annular transversely beveled bushing in said cutter to engage said flange, and means to removably secure said cutter on said'flange.

3. In a rotary boring drill, a head having a bore, a transversely beveled flange projecting from said head adjacent said bore, a cutter, a transversely beveled bushing in said cutter adapted to slidably engage said iange, anda removable spindle resting in said bore and extending into said bushing;

4. In a rotary boring drill a ead having L a bore, a transversely beve ed flange projecting from said head adjacent saidbore, a cutter," a bushing rotatably locked in said cutter and' having a transverse beveled surface to engage said flange, and a spindle ocked in, said bushing and secured in said 5.l In a rotary boring drill, a head having a bore and an annular iange adjacent said bore, said flange having a slot therein, a

transversely beveled bushing resting on saidflange and having a key fitting in said slot, a cutter on said bushin and removable means to hold said bus ing against said flange.

6. In a rotary boring drill, a head ha a". recess, a bore, and a transversely bevel flange adjacent said bore and projecting into said recess, a cutter, a transversely beveled bushing in-said cutter to engage said beveled flange, and a spindle inserted from the outside of said head into said bore, and means to removably secure said bushing to the inner end of said spindle.

7. In a rotary boring drill, a head having a bore, a recess, and an annular transversely beveled liange adjacent said bore and projecting into said recess, a cutter, an annular Ytransversely,beveled bushing in said cutter to engage said flange a spindle in said bore,

v and'means to remova l secure said bushing to the end of said spin le, said spindle being removable outwardly thro h said bore.

l8. In a rota boring dri l, a head having a substantially -shaped recess in the bottom thereof, anda pair of substantially conical cutters in said recess', said head having a transversely beveled annular `iian e extending into said recess, a transverse y beveled lbushing in one of said cutters adapted to `'engage sald flange, and-means to removably secure said bushing on said ange.

9. In a roller bit, a bushing having a transversely beveled end, and an annular liange, and a cutter on said bushing, said cutter comprising a point section on one side of said flange and a base section on the other side of said ange.

10. A roller cutter bushing comprising a i body having a transversely beveled end and a key on said end.

11. A roller cutter bushing comprising a body having a transversely beveled end, an external annular groove, and an external annular -flange between said end and said groove.

In testimony whereof, I hereunto aix my signature.

CLINTON' M. BULL. 

